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([82.78.167.171]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-427a5e77488sm121546145e9.9.2024.07.16.03.30.37 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 16 Jul 2024 03:30:38 -0700 (PDT) From: Claudiu X-Google-Original-From: Claudiu To: lee@kernel.org, robh@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org, alexandre.belloni@bootlin.com, geert+renesas@glider.be, magnus.damm@gmail.com, mturquette@baylibre.com, sboyd@kernel.org, p.zabel@pengutronix.de Cc: devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-rtc@vger.kernel.org, linux-renesas-soc@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-clk@vger.kernel.org, claudiu.beznea@tuxon.dev, Claudiu Beznea Subject: [PATCH v2 02/11] mfd: renesas-vbattb: Add a MFD driver for the Renesas VBATTB IP Date: Tue, 16 Jul 2024 13:30:16 +0300 Message-Id: <20240716103025.1198495-3-claudiu.beznea.uj@bp.renesas.com> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20240716103025.1198495-1-claudiu.beznea.uj@bp.renesas.com> References: <20240716103025.1198495-1-claudiu.beznea.uj@bp.renesas.com> Precedence: bulk X-Mailing-List: linux-renesas-soc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: Claudiu Beznea Renesas VBATTB IP has logic to control the RTC clock, tamper detection and a small 128B memory. Add a MFD driver to do the basic initialization of the VBATTB IP for the inner components to work. Signed-off-by: Claudiu Beznea --- Changes in v2: - none; this driver is new drivers/mfd/Kconfig | 8 ++++ drivers/mfd/Makefile | 1 + drivers/mfd/renesas-vbattb.c | 78 ++++++++++++++++++++++++++++++++++++ 3 files changed, 87 insertions(+) create mode 100644 drivers/mfd/renesas-vbattb.c diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig index bc8be2e593b6..df93e8b05065 100644 --- a/drivers/mfd/Kconfig +++ b/drivers/mfd/Kconfig @@ -1383,6 +1383,14 @@ config MFD_SC27XX_PMIC This driver provides common support for accessing the SC27xx PMICs, and it also adds the irq_chip parts for handling the PMIC chip events. +config MFD_RENESAS_VBATTB + tristate "Renesas VBATTB driver" + depends on (ARCH_RZG2L && OF) || COMPILE_TEST + select MFD_CORE + help + Select this option to enable Renesas RZ/G3S VBATTB driver which + provides support for the RTC clock, tamper detector and 128B SRAM. + config RZ_MTU3 tristate "Renesas RZ/G2L MTU3a core driver" depends on (ARCH_RZG2L && OF) || COMPILE_TEST diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile index 02b651cd7535..cd2f27492df2 100644 --- a/drivers/mfd/Makefile +++ b/drivers/mfd/Makefile @@ -186,6 +186,7 @@ pcf50633-objs := pcf50633-core.o pcf50633-irq.o obj-$(CONFIG_MFD_PCF50633) += pcf50633.o obj-$(CONFIG_PCF50633_ADC) += pcf50633-adc.o obj-$(CONFIG_PCF50633_GPIO) += pcf50633-gpio.o +obj-$(CONFIG_MFD_RENESAS_VBATTB) += renesas-vbattb.o obj-$(CONFIG_RZ_MTU3) += rz-mtu3.o obj-$(CONFIG_ABX500_CORE) += abx500-core.o obj-$(CONFIG_MFD_DB8500_PRCMU) += db8500-prcmu.o diff --git a/drivers/mfd/renesas-vbattb.c b/drivers/mfd/renesas-vbattb.c new file mode 100644 index 000000000000..5d71565b8cbf --- /dev/null +++ b/drivers/mfd/renesas-vbattb.c @@ -0,0 +1,78 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * VBATTB driver + * + * Copyright (C) 2024 Renesas Electronics Corp. + */ + +#include +#include +#include +#include +#include + +static int vbattb_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct reset_control *rstc; + int ret; + + rstc = devm_reset_control_array_get_exclusive(dev); + if (IS_ERR(rstc)) + return PTR_ERR(rstc); + + ret = devm_pm_runtime_enable(dev); + if (ret) + return ret; + + ret = pm_runtime_resume_and_get(dev); + if (ret) + return ret; + + ret = reset_control_deassert(rstc); + if (ret) + goto rpm_put; + + platform_set_drvdata(pdev, rstc); + + ret = devm_of_platform_populate(dev); + if (ret) + goto reset_assert; + + return 0; + +reset_assert: + reset_control_assert(rstc); +rpm_put: + pm_runtime_put(dev); + return ret; +} + +static void vbattb_remove(struct platform_device *pdev) +{ + struct reset_control *rstc = platform_get_drvdata(pdev); + + reset_control_assert(rstc); + pm_runtime_put(&pdev->dev); +} + +static const struct of_device_id vbattb_match[] = { + { .compatible = "renesas,r9a08g045-vbattb" }, + { /* sentinel */ }, +}; +MODULE_DEVICE_TABLE(of, vbattb_match); + +static struct platform_driver vbattb_driver = { + .probe = vbattb_probe, + .remove_new = vbattb_remove, + .driver = { + .name = "renesas-vbattb", + .of_match_table = vbattb_match, + }, +}; +module_platform_driver(vbattb_driver); + +MODULE_ALIAS("platform:renesas-vbattb"); +MODULE_AUTHOR("Claudiu Beznea "); +MODULE_DESCRIPTION("Renesas VBATTB driver"); +MODULE_LICENSE("GPL");